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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Xapian: API Documentation: Xapian::FixedWeightPostingSource Class Reference</title>
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<li class="navelem"><a class="el" href="namespaceXapian.html">Xapian</a></li><li class="navelem"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html">FixedWeightPostingSource</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">Xapian::FixedWeightPostingSource Class Reference</div> </div>
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<p>A posting source which returns a fixed weight for all documents.
<a href="classXapian_1_1FixedWeightPostingSource.html#details">More...</a></p>
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<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for Xapian::FixedWeightPostingSource:</div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a82d389768f1d69221cab83d74732fd16"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a82d389768f1d69221cab83d74732fd16">FixedWeightPostingSource</a> (double wt)</td></tr>
<tr class="memdesc:a82d389768f1d69221cab83d74732fd16"><td class="mdescLeft"> </td><td class="mdescRight">Construct a <a class="el" href="classXapian_1_1FixedWeightPostingSource.html" title="A posting source which returns a fixed weight for all documents. ">FixedWeightPostingSource</a>. <a href="#a82d389768f1d69221cab83d74732fd16">More...</a><br /></td></tr>
<tr class="separator:a82d389768f1d69221cab83d74732fd16"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae22eeb74290e601e58efcb1f89c5e446"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#ae22eeb74290e601e58efcb1f89c5e446">get_termfreq_min</a> () const</td></tr>
<tr class="memdesc:ae22eeb74290e601e58efcb1f89c5e446"><td class="mdescLeft"> </td><td class="mdescRight">A lower bound on the number of documents this object can return. <a href="#ae22eeb74290e601e58efcb1f89c5e446">More...</a><br /></td></tr>
<tr class="separator:ae22eeb74290e601e58efcb1f89c5e446"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab30ce9ad09792a948bbb3b6670d73525"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#ab30ce9ad09792a948bbb3b6670d73525">get_termfreq_est</a> () const</td></tr>
<tr class="memdesc:ab30ce9ad09792a948bbb3b6670d73525"><td class="mdescLeft"> </td><td class="mdescRight">An estimate of the number of documents this object can return. <a href="#ab30ce9ad09792a948bbb3b6670d73525">More...</a><br /></td></tr>
<tr class="separator:ab30ce9ad09792a948bbb3b6670d73525"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a10ccfe06a7c5cf60bd9118b938d753f8"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a10ccfe06a7c5cf60bd9118b938d753f8">get_termfreq_max</a> () const</td></tr>
<tr class="memdesc:a10ccfe06a7c5cf60bd9118b938d753f8"><td class="mdescLeft"> </td><td class="mdescRight">An upper bound on the number of documents this object can return. <a href="#a10ccfe06a7c5cf60bd9118b938d753f8">More...</a><br /></td></tr>
<tr class="separator:a10ccfe06a7c5cf60bd9118b938d753f8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a74d1255de88916bf823b902c5da77f66"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a74d1255de88916bf823b902c5da77f66">get_weight</a> () const</td></tr>
<tr class="memdesc:a74d1255de88916bf823b902c5da77f66"><td class="mdescLeft"> </td><td class="mdescRight">Return the weight contribution for the current document. <a href="#a74d1255de88916bf823b902c5da77f66">More...</a><br /></td></tr>
<tr class="separator:a74d1255de88916bf823b902c5da77f66"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5387052adf96613d7528862ef5ffd3ce"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a5387052adf96613d7528862ef5ffd3ce">next</a> (double min_wt)</td></tr>
<tr class="memdesc:a5387052adf96613d7528862ef5ffd3ce"><td class="mdescLeft"> </td><td class="mdescRight">Advance the current position to the next matching document. <a href="#a5387052adf96613d7528862ef5ffd3ce">More...</a><br /></td></tr>
<tr class="separator:a5387052adf96613d7528862ef5ffd3ce"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a90fc7e7c584e400f2eb1442ac02dfba4"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a90fc7e7c584e400f2eb1442ac02dfba4">skip_to</a> (<a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> min_docid, double min_wt)</td></tr>
<tr class="memdesc:a90fc7e7c584e400f2eb1442ac02dfba4"><td class="mdescLeft"> </td><td class="mdescRight">Advance to the specified docid. <a href="#a90fc7e7c584e400f2eb1442ac02dfba4">More...</a><br /></td></tr>
<tr class="separator:a90fc7e7c584e400f2eb1442ac02dfba4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:acd408e3a5cb1cdd02b0fa382b1afb9aa"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#acd408e3a5cb1cdd02b0fa382b1afb9aa">check</a> (<a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> min_docid, double min_wt)</td></tr>
<tr class="memdesc:acd408e3a5cb1cdd02b0fa382b1afb9aa"><td class="mdescLeft"> </td><td class="mdescRight">Check if the specified docid occurs. <a href="#acd408e3a5cb1cdd02b0fa382b1afb9aa">More...</a><br /></td></tr>
<tr class="separator:acd408e3a5cb1cdd02b0fa382b1afb9aa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1902a25f0ca56bfd772225efdce0303b"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a1902a25f0ca56bfd772225efdce0303b">at_end</a> () const</td></tr>
<tr class="memdesc:a1902a25f0ca56bfd772225efdce0303b"><td class="mdescLeft"> </td><td class="mdescRight">Return true if the current position is past the last entry in this list. <a href="#a1902a25f0ca56bfd772225efdce0303b">More...</a><br /></td></tr>
<tr class="separator:a1902a25f0ca56bfd772225efdce0303b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8491b5d1bf7557b7b2e3de30cab07acf"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a8491b5d1bf7557b7b2e3de30cab07acf">get_docid</a> () const</td></tr>
<tr class="memdesc:a8491b5d1bf7557b7b2e3de30cab07acf"><td class="mdescLeft"> </td><td class="mdescRight">Return the current docid. <a href="#a8491b5d1bf7557b7b2e3de30cab07acf">More...</a><br /></td></tr>
<tr class="separator:a8491b5d1bf7557b7b2e3de30cab07acf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8ffcb0e2bdef666ffed14cdaf1eee0e4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html">FixedWeightPostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a8ffcb0e2bdef666ffed14cdaf1eee0e4">clone</a> () const</td></tr>
<tr class="memdesc:a8ffcb0e2bdef666ffed14cdaf1eee0e4"><td class="mdescLeft"> </td><td class="mdescRight">Clone the posting source. <a href="#a8ffcb0e2bdef666ffed14cdaf1eee0e4">More...</a><br /></td></tr>
<tr class="separator:a8ffcb0e2bdef666ffed14cdaf1eee0e4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1941bb382b3260bdf188151339ebb26b"><td class="memItemLeft" align="right" valign="top">std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a1941bb382b3260bdf188151339ebb26b">name</a> () const</td></tr>
<tr class="memdesc:a1941bb382b3260bdf188151339ebb26b"><td class="mdescLeft"> </td><td class="mdescRight">Name of the posting source class. <a href="#a1941bb382b3260bdf188151339ebb26b">More...</a><br /></td></tr>
<tr class="separator:a1941bb382b3260bdf188151339ebb26b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3341be21837bf85c2061a5fa9fe682c2"><td class="memItemLeft" align="right" valign="top">std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3341be21837bf85c2061a5fa9fe682c2">serialise</a> () const</td></tr>
<tr class="memdesc:a3341be21837bf85c2061a5fa9fe682c2"><td class="mdescLeft"> </td><td class="mdescRight">Serialise object parameters into a string. <a href="#a3341be21837bf85c2061a5fa9fe682c2">More...</a><br /></td></tr>
<tr class="separator:a3341be21837bf85c2061a5fa9fe682c2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a241fae1eb9fca4d72b65c3ca9b313ffb"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html">FixedWeightPostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a241fae1eb9fca4d72b65c3ca9b313ffb">unserialise</a> (const std::string &serialised) const</td></tr>
<tr class="memdesc:a241fae1eb9fca4d72b65c3ca9b313ffb"><td class="mdescLeft"> </td><td class="mdescRight">Create object given string serialisation returned by <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3341be21837bf85c2061a5fa9fe682c2" title="Serialise object parameters into a string. ">serialise()</a>. <a href="#a241fae1eb9fca4d72b65c3ca9b313ffb">More...</a><br /></td></tr>
<tr class="separator:a241fae1eb9fca4d72b65c3ca9b313ffb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3c9698d1d0d4d47247bd19451e1e2077"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077">init</a> (const <a class="el" href="classXapian_1_1Database.html">Database</a> &db_)</td></tr>
<tr class="memdesc:a3c9698d1d0d4d47247bd19451e1e2077"><td class="mdescLeft"> </td><td class="mdescRight">Set this <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> to the start of the list of postings. <a href="#a3c9698d1d0d4d47247bd19451e1e2077">More...</a><br /></td></tr>
<tr class="separator:a3c9698d1d0d4d47247bd19451e1e2077"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a89edb2843e09624e63d06246ec21d768"><td class="memItemLeft" align="right" valign="top">std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a89edb2843e09624e63d06246ec21d768">get_description</a> () const</td></tr>
<tr class="memdesc:a89edb2843e09624e63d06246ec21d768"><td class="mdescLeft"> </td><td class="mdescRight">Return a string describing this object. <a href="#a89edb2843e09624e63d06246ec21d768">More...</a><br /></td></tr>
<tr class="separator:a89edb2843e09624e63d06246ec21d768"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_classXapian_1_1PostingSource"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classXapian_1_1PostingSource')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classXapian_1_1PostingSource.html">Xapian::PostingSource</a></td></tr>
<tr class="memitem:a82e85d6113d9c8e72cbbf4b3362f3fd6 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top"><a id="a82e85d6113d9c8e72cbbf4b3362f3fd6"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a82e85d6113d9c8e72cbbf4b3362f3fd6">PostingSource</a> ()</td></tr>
<tr class="memdesc:a82e85d6113d9c8e72cbbf4b3362f3fd6 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Allow subclasses to be instantiated. <br /></td></tr>
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<tr class="memitem:a7201a6a189625b17f501561dcc3ea8a1 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a7201a6a189625b17f501561dcc3ea8a1">set_maxweight</a> (double max_weight)</td></tr>
<tr class="memdesc:a7201a6a189625b17f501561dcc3ea8a1 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Specify an upper bound on what <a class="el" href="classXapian_1_1PostingSource.html#a3922b7e3572eea6d3e39fc26cc7fed7a" title="Return the weight contribution for the current document. ">get_weight()</a> will return from now on. <a href="classXapian_1_1PostingSource.html#a7201a6a189625b17f501561dcc3ea8a1">More...</a><br /></td></tr>
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<tr class="memitem:a1a447843283a8ef88b3d4662c97c87b4 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top"><a id="a1a447843283a8ef88b3d4662c97c87b4"></a>
double </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a1a447843283a8ef88b3d4662c97c87b4">get_maxweight</a> () const</td></tr>
<tr class="memdesc:a1a447843283a8ef88b3d4662c97c87b4 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Return the currently set upper bound on what <a class="el" href="classXapian_1_1PostingSource.html#a3922b7e3572eea6d3e39fc26cc7fed7a" title="Return the weight contribution for the current document. ">get_weight()</a> can return. <br /></td></tr>
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<tr class="memitem:a4cadf2ff56f9e456e1f5a6b684cdb128 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classXapian_1_1PostingSource.html">PostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a4cadf2ff56f9e456e1f5a6b684cdb128">unserialise_with_registry</a> (const std::string &serialised, const <a class="el" href="classXapian_1_1Registry.html">Registry</a> &registry) const</td></tr>
<tr class="memdesc:a4cadf2ff56f9e456e1f5a6b684cdb128 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Create object given string serialisation returned by <a class="el" href="classXapian_1_1PostingSource.html#a0ad6b98d6b5e79a37b7a1d7874725894" title="Serialise object parameters into a string. ">serialise()</a>. <a href="classXapian_1_1PostingSource.html#a4cadf2ff56f9e456e1f5a6b684cdb128">More...</a><br /></td></tr>
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<tr class="memitem:a24d51135b279b59bccb37d42bc2062f1 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classXapian_1_1PostingSource.html">PostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a24d51135b279b59bccb37d42bc2062f1">release</a> ()</td></tr>
<tr class="memdesc:a24d51135b279b59bccb37d42bc2062f1 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Start reference counting this object. <a href="classXapian_1_1PostingSource.html#a24d51135b279b59bccb37d42bc2062f1">More...</a><br /></td></tr>
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<tr class="memitem:a15a62840bd29a630b8641722c2b8cbf8 inherit pub_methods_classXapian_1_1PostingSource"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classXapian_1_1PostingSource.html">PostingSource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classXapian_1_1PostingSource.html#a15a62840bd29a630b8641722c2b8cbf8">release</a> () const</td></tr>
<tr class="memdesc:a15a62840bd29a630b8641722c2b8cbf8 inherit pub_methods_classXapian_1_1PostingSource"><td class="mdescLeft"> </td><td class="mdescRight">Start reference counting this object. <a href="classXapian_1_1PostingSource.html#a15a62840bd29a630b8641722c2b8cbf8">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A posting source which returns a fixed weight for all documents. </p>
<p>This returns entries for all documents in the given database, with a fixed weight (specified by a parameter to the constructor). </p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a82d389768f1d69221cab83d74732fd16">◆ </a></span>FixedWeightPostingSource()</h2>
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<td class="memname">Xapian::FixedWeightPostingSource::FixedWeightPostingSource </td>
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<p>Construct a <a class="el" href="classXapian_1_1FixedWeightPostingSource.html" title="A posting source which returns a fixed weight for all documents. ">FixedWeightPostingSource</a>. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">wt</td><td>The fixed weight to return. </td></tr>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a1902a25f0ca56bfd772225efdce0303b">◆ </a></span>at_end()</h2>
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<p>Return true if the current position is past the last entry in this list. </p>
<p>At least one of <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a5387052adf96613d7528862ef5ffd3ce" title="Advance the current position to the next matching document. ">next()</a></em>, <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a90fc7e7c584e400f2eb1442ac02dfba4" title="Advance to the specified docid. ">skip_to()</a></em> or <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#acd408e3a5cb1cdd02b0fa382b1afb9aa" title="Check if the specified docid occurs. ">check()</a></em> will be called before this method is first called. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a98831c9fdea1599f588cd9fef51bbeb5">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#acd408e3a5cb1cdd02b0fa382b1afb9aa">◆ </a></span>check()</h2>
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<td class="memname">bool Xapian::FixedWeightPostingSource::check </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> </td>
<td class="paramname"><em>did</em>, </td>
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<p>Check if the specified docid occurs. </p>
<p>The caller is required to ensure that the specified document id <em>did</em> actually exists in the database. If it does, it must move to that document id, and return true. If it does not, it may either:</p>
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<li>return true, having moved to a definite position (including "at_end"), which must be the same position as <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a90fc7e7c584e400f2eb1442ac02dfba4" title="Advance to the specified docid. ">skip_to()</a> would have moved to.</li>
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<p>or</p>
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<li>return false, having moved to an "indeterminate" position, such that a subsequent call to <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a5387052adf96613d7528862ef5ffd3ce" title="Advance the current position to the next matching document. ">next()</a> or <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a90fc7e7c584e400f2eb1442ac02dfba4" title="Advance to the specified docid. ">skip_to()</a> will move to the next matching position after <em>did</em>.</li>
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<p>Generally, this method should act like <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a90fc7e7c584e400f2eb1442ac02dfba4" title="Advance to the specified docid. ">skip_to()</a> and return true if that can be done at little extra cost.</p>
<p>Otherwise it should simply check if a particular docid is present, returning true if it is, and false if it isn't.</p>
<p>The default implementation calls <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a90fc7e7c584e400f2eb1442ac02dfba4" title="Advance to the specified docid. ">skip_to()</a> and always returns true.</p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time.</p>
<p>Note: in the case of a multi-database search, the docid specified is the docid in the single subdatabase relevant to this posting source. See the <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a></em> method for details.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">did</td><td>The document id to check. </td></tr>
<tr><td class="paramname">min_wt</td><td>The minimum weight contribution that is needed (this is just a hint which subclasses may ignore). </td></tr>
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<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#a964696f90b6485bf3c931ccf4546a273">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a8ffcb0e2bdef666ffed14cdaf1eee0e4">◆ </a></span>clone()</h2>
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<td class="memname"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html">FixedWeightPostingSource</a>* Xapian::FixedWeightPostingSource::clone </td>
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<p>Clone the posting source. </p>
<p>The clone should inherit the configuration of the parent, but need not inherit the state. ie, the clone does not need to be in the same iteration position as the original: the matcher will always call <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a> on the clone before attempting to move the iterator, or read the information about the current position of the iterator.</p>
<p>This may return NULL to indicate that cloning is not supported. In this case, the <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> may only be used with a single-database search.</p>
<p>The default implementation returns NULL.</p>
<p>Note that the returned object will be deallocated by <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> after use with "delete". If you want to handle the deletion in a special way (for example when wrapping the <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> API for use from another language) then you can define a static <code>operator delete</code> method in your subclass as shown here: <a href="https://trac.xapian.org/ticket/554#comment:1">https://trac.xapian.org/ticket/554#comment:1</a> </p>
<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#ab41013bf3d3dc7d433430a69466b8582">Xapian::PostingSource</a>.</p>
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<p>Return a string describing this object. </p>
<p>This default implementation returns a generic answer. This default it provided to avoid forcing those deriving their own <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> subclass from having to implement this (they may not care what <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a89edb2843e09624e63d06246ec21d768" title="Return a string describing this object. ">get_description()</a> gives for their subclass). </p>
<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#a8a619b261e7d9db7cb7ccef9869afac8">Xapian::PostingSource</a>.</p>
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<td class="memname"><a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> Xapian::FixedWeightPostingSource::get_docid </td>
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<p>Return the current docid. </p>
<p>This method may assume that it will only be called when there is a "current document". See <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a74d1255de88916bf823b902c5da77f66" title="Return the weight contribution for the current document. ">get_weight()</a></em> for details.</p>
<p>Note: in the case of a multi-database search, the returned docid should be in the single subdatabase relevant to this posting source. See the <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a></em> method for details. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a7b1bd1fcd07d69204f70155588ae544a">Xapian::PostingSource</a>.</p>
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<td class="memname"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> Xapian::FixedWeightPostingSource::get_termfreq_est </td>
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<p>An estimate of the number of documents this object can return. </p>
<p>It must always be true that:</p>
<p><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#ae22eeb74290e601e58efcb1f89c5e446" title="A lower bound on the number of documents this object can return. ">get_termfreq_min()</a> <= <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#ab30ce9ad09792a948bbb3b6670d73525" title="An estimate of the number of documents this object can return. ">get_termfreq_est()</a> <= <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a10ccfe06a7c5cf60bd9118b938d753f8" title="An upper bound on the number of documents this object can return. ">get_termfreq_max()</a></p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a0d67eda5783f82951d6c56ad7ff4205b">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a10ccfe06a7c5cf60bd9118b938d753f8">◆ </a></span>get_termfreq_max()</h2>
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<p>An upper bound on the number of documents this object can return. </p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a17de27c84a052c51d62ad498151a4cab">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ae22eeb74290e601e58efcb1f89c5e446">◆ </a></span>get_termfreq_min()</h2>
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<td class="memname"><a class="el" href="namespaceXapian.html#a9bbd62a8e56ea4619e4e59afb32aced6">Xapian::doccount</a> Xapian::FixedWeightPostingSource::get_termfreq_min </td>
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<p>A lower bound on the number of documents this object can return. </p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a5ecf450314e8b266eb9c8fae78e141d3">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a74d1255de88916bf823b902c5da77f66">◆ </a></span>get_weight()</h2>
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<p>Return the weight contribution for the current document. </p>
<p>This default implementation always returns 0, for convenience when implementing "weight-less" <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> subclasses.</p>
<p>This method may assume that it will only be called when there is a "current document". In detail: <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time. It will also only call this if the <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> reports that it is pointing to a valid document (ie, it will not call it before calling at least one of <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a5387052adf96613d7528862ef5ffd3ce" title="Advance the current position to the next matching document. ">next()</a>, <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a90fc7e7c584e400f2eb1442ac02dfba4" title="Advance to the specified docid. ">skip_to()</a> or <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#acd408e3a5cb1cdd02b0fa382b1afb9aa" title="Check if the specified docid occurs. ">check()</a>, and will ensure that the <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> is not at the end by calling <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a1902a25f0ca56bfd772225efdce0303b" title="Return true if the current position is past the last entry in this list. ">at_end()</a>). </p>
<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#a3922b7e3572eea6d3e39fc26cc7fed7a">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3c9698d1d0d4d47247bd19451e1e2077">◆ </a></span>init()</h2>
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<td class="memname">void Xapian::FixedWeightPostingSource::init </td>
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<td class="paramtype">const <a class="el" href="classXapian_1_1Database.html">Database</a> & </td>
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<p>Set this <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> to the start of the list of postings. </p>
<p>This is called automatically by the matcher prior to each query being processed.</p>
<p>If a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> is used for multiple searches, <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a></em> will therefore be called multiple times, and must handle this by using the database passed in the most recent call.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">db</td><td>The database which the <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> should iterate through.</td></tr>
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<p>Note: in the case of a multi-database search, a separate <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> will be used for each database (the separate PostingSources will be obtained using <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a8ffcb0e2bdef666ffed14cdaf1eee0e4" title="Clone the posting source. ">clone()</a></em>), and each <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> will be passed one of the sub-databases as the <em>db</em> parameter here. The <em>db</em> parameter will therefore always refer to a single database. All docids passed to, or returned from, the <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> refer to docids in that single database, rather than in the multi-database. </p>
<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a81d793170b496022488c15c3508979b5">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1941bb382b3260bdf188151339ebb26b">◆ </a></span>name()</h2>
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<p>Name of the posting source class. </p>
<p>This is used when serialising and unserialising posting sources; for example, for performing remote searches.</p>
<p>If the subclass is in a C++ namespace, the namespace should be included in the name, using "::" as a separator. For example, for a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> subclass called "FooPostingSource" in the "Xapian" namespace the result of this call should be "Xapian::FooPostingSource".</p>
<p>This should only be implemented if <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3341be21837bf85c2061a5fa9fe682c2" title="Serialise object parameters into a string. ">serialise()</a> and <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a241fae1eb9fca4d72b65c3ca9b313ffb" title="Create object given string serialisation returned by serialise(). ">unserialise()</a> are also implemented. The default implementation returns an empty string.</p>
<p>If this returns an empty string, <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will assume that <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3341be21837bf85c2061a5fa9fe682c2" title="Serialise object parameters into a string. ">serialise()</a> and <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a241fae1eb9fca4d72b65c3ca9b313ffb" title="Create object given string serialisation returned by serialise(). ">unserialise()</a> are not implemented. </p>
<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#a6cbbe96a7bb0d2a8c9de3d5d8b99675d">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a5387052adf96613d7528862ef5ffd3ce">◆ </a></span>next()</h2>
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<td class="memname">void Xapian::FixedWeightPostingSource::next </td>
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<p>Advance the current position to the next matching document. </p>
<p>The <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> starts before the first entry in the list, so <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a5387052adf96613d7528862ef5ffd3ce" title="Advance the current position to the next matching document. ">next()</a> must be called before any methods which need the context of the current position.</p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">min_wt</td><td>The minimum weight contribution that is needed (this is just a hint which subclasses may ignore). </td></tr>
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<p>Implements <a class="el" href="classXapian_1_1PostingSource.html#a150c4c07ff4e959f448dd8cf840968e8">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3341be21837bf85c2061a5fa9fe682c2">◆ </a></span>serialise()</h2>
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<p>Serialise object parameters into a string. </p>
<p>The serialised parameters should represent the configuration of the posting source, but need not (indeed, should not) represent the current iteration state.</p>
<p>If you don't want to support the remote backend, you can use the default implementation which simply throws <a class="el" href="classXapian_1_1UnimplementedError.html" title="UnimplementedError indicates an attempt to use an unimplemented feature. ">Xapian::UnimplementedError</a>. </p>
<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#a0ad6b98d6b5e79a37b7a1d7874725894">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a90fc7e7c584e400f2eb1442ac02dfba4">◆ </a></span>skip_to()</h2>
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<td class="memname">void Xapian::FixedWeightPostingSource::skip_to </td>
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<td class="paramtype"><a class="el" href="namespaceXapian.html#ad8f7a78bc920532b7d2baa3281b33e2f">Xapian::docid</a> </td>
<td class="paramname"><em>did</em>, </td>
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<p>Advance to the specified docid. </p>
<p>If the specified docid isn't in the list, position ourselves on the first document after it (or <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a1902a25f0ca56bfd772225efdce0303b" title="Return true if the current position is past the last entry in this list. ">at_end()</a> if no greater docids are present).</p>
<p>If the current position is already the specified docid, this method will leave the position unmodified.</p>
<p>If the specified docid is earlier than the current position, the behaviour is unspecified. A sensible behaviour would be to leave the current position unmodified, but it is also reasonable to move to the specified docid.</p>
<p>The default implementation calls <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a5387052adf96613d7528862ef5ffd3ce" title="Advance the current position to the next matching document. ">next()</a> repeatedly, which works but <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a90fc7e7c584e400f2eb1442ac02dfba4" title="Advance to the specified docid. ">skip_to()</a> can often be implemented much more efficiently.</p>
<p><a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> will always call <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a> on a <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> before calling this for the first time.</p>
<p>Note: in the case of a multi-database search, the docid specified is the docid in the single subdatabase relevant to this posting source. See the <em><a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3c9698d1d0d4d47247bd19451e1e2077" title="Set this PostingSource to the start of the list of postings. ">init()</a></em> method for details.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">did</td><td>The document id to advance to. </td></tr>
<tr><td class="paramname">min_wt</td><td>The minimum weight contribution that is needed (this is just a hint which subclasses may ignore). </td></tr>
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<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#acf18a9328d8e46c3a759a3a120009607">Xapian::PostingSource</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a241fae1eb9fca4d72b65c3ca9b313ffb">◆ </a></span>unserialise()</h2>
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<td class="memname"><a class="el" href="classXapian_1_1FixedWeightPostingSource.html">FixedWeightPostingSource</a>* Xapian::FixedWeightPostingSource::unserialise </td>
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<p>Create object given string serialisation returned by <a class="el" href="classXapian_1_1FixedWeightPostingSource.html#a3341be21837bf85c2061a5fa9fe682c2" title="Serialise object parameters into a string. ">serialise()</a>. </p>
<p>Note that the returned object will be deallocated by <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> after use with "delete". If you want to handle the deletion in a special way (for example when wrapping the <a class="el" href="namespaceXapian.html" title="The Xapian namespace contains public interfaces for the Xapian library. ">Xapian</a> API for use from another language) then you can define a static <code>operator delete</code> method in your subclass as shown here: <a href="https://trac.xapian.org/ticket/554#comment:1">https://trac.xapian.org/ticket/554#comment:1</a></p>
<p>If you don't want to support the remote backend, you can use the default implementation which simply throws <a class="el" href="classXapian_1_1UnimplementedError.html" title="UnimplementedError indicates an attempt to use an unimplemented feature. ">Xapian::UnimplementedError</a>.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">serialised</td><td>A serialised instance of this <a class="el" href="classXapian_1_1PostingSource.html" title="Base class which provides an "external" source of postings. ">PostingSource</a> subclass. </td></tr>
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<p>Reimplemented from <a class="el" href="classXapian_1_1PostingSource.html#a6aa8602abb801a2a366a6328d36ba4a9">Xapian::PostingSource</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>xapian/<a class="el" href="postingsource_8h.html">postingsource.h</a></li>
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Documentation for Xapian (version 1.4.3).<br>
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